<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>记事本</title>
</head>
<body>
    <section id="todoapp">
        <header class="header">
            <h1>小黑笔记本</h1>
            <input v-model="inputValue" @keyup.enter="add" autofocus="autofocus" autocomplete="off" placeholder="请输入任务"
            class="new-todo">
        </header>
        <section class="main">
            <ul class="todo-list">
                <li class="todo" v-for="(item,index) in list">
                    <div class="view">
                        <span class="index">{{index+1}}.</span>
                        <label>{{item}}</label>
                        <button class="destroy" @click="remove(index)">删除</button>
                    </div>
                </li>
            </ul>
        </section>
        <footer class="info">
            <span id="todo_count" v-if="list.length != 0">
                <strong>{{list.length}}</strong>
                items left
            </span>
            <button id="clear_completed" v-show="list.length != 0" @click="clear">
                Clear
            </button>
        </footer>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:"#todoapp",
            data:{
                list:["吃饭","睡觉","打代码"],
                inputValue:"好好学习，天堂向上"
            },
            methods: {
                add:function(){
                    this.list.push(this.inputValue);
                },
                remove:function(index){
                    this.list.splice(index,1);
                },
                clear:function(){
                    this.list=[]
                }
            }
        })
    </script>
</body>
</html>